Thank you A$AP and thank you Based God. During his set for the ‘Rocky and Tyler’ show at the Bill Graham Civic Auditorium in San Francisco last night, A$AP Rocky brought out Lil B. After A$AP gave an epic intro asking what the audience what “TYBG” means, the Based God hopped on stage to performed his classic track “Like A Martian” with Rocky. As you can see, Lil B is donning the tightest (literally and figuratively) Sonic T-shirt ever. Check out a few photos and video clips of the epic encounter below.